Postcards from London tells the story of beautiful teenager Jim (Harris Dickinson of Beach Rats, The Darkest Minds), who finds himself in Soho where he falls in with The Raconteurs - a gang of unusual high class male escorts who specialize in post-coital conversation. From shy novice to sought after escort and eventually artist's muse, Jim would be the toast of the town if it wasn't for his annoying affliction. He suffers from Stendahl Syndrome, a rare condition which causes him to hallucinate and faint when he counters real works of art. But when Jim is roped into the world of detecting art forgery, could his condition bring about his downfall?